Apparatus for shaping and truing brake drums



May 26, 1925.

G. C. BRAINARD APPARATUS FOR SHAPING AND TRUING BRAKE DRUMS Filed Jan. 1921 5 SheetS -Sheet 1 ja /m G C, 73m An. 4

G. C. BRAINARD APPARATUS FOR SHAPING AND TRUING BRAKE DRUMS Filed Jan. 1921 5 Sheets-Sheet 2 May 26, 1925. 1,539,800

G. C. BRAINARD APPARATUS FOR SHAPING AND TRUING BRAKE DRUMS F115 Jan. 7. 1921 5 Sheets-Sheet May 26, 1' 925.

G. u. BRAINARD APPARATUS FOR SHAPING AND TRUING BRAKE DRUMS Filed Jan. 1921 5 Sheets-Sheet 4 May 26, 1925.

' G. C. BRAINARD APPARATUS FOR SHAPING AND TRUING BRAKE DRUMS Filed Jan. 1921 5 Sheets-Sheet 5.

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UNITED STATES. PATENT orrlcs.

GEORGE C. BRAIHABD, OF CLEVELAND, Di-IIC, ASSIGNOR TO HYDRAULIC STEEL COM- PANY, F CLEVELAND, OHIO, A CORPORATION OI OHIQ.

APPARATUS FOR SHAPING- AHD TRUING BRAKE DRUMS.

Application filed January 7, 1921. Serial No. 435,654.

To all whom it may concern:

Be it known that I, Gnonon C. BRAI'NARD, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Apparatus for Shaping and lruing Brake Drums, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to an apparatus for sizing and shaping brake drums for auto1nobile 'Wheels and more particularly to a compressing device wherein pressure is applied to the periphery and face ot the drum for the purpose of sl "inking or compressing the same into a definite size and true shape, as in some instances the drum is out of true both circunilerentially ant. also out of plane. In other instances the drum may be oversized, in which event it must be shrunk to the proper size and as before stat-ed, this inrention relates to an apparatus for quickly and easily accomplishing these sizing and shaping operations. With these various ohj-ccts in View and certain others; which will become apparent as the description proceeds, the invention consists in the novel features of construction and in the manner of coinng'ing the same, all of which described hereinafter and set appe ed claims.

in the dra g; tor-li ting a part of this speci cation, 1 is a front elevati-on'o'f hine enn'iodying one form Olin-y in vention': Fig. 2 a transverse vertical section on the line of Fig. 1; Fig. 3 a face view of the segment plate; t sectional View of the same partly in ole-ration on the line 4 tot Fig.3; Fig. 5 is a \i n of the upper portion of the :sl inhing ring; Fig. is perspective View of one of the s'hrinkcr blocks; 7 is a detail per spective View of one of the shrinking ring Wedges; 8 is a detail sectional View of shrinker 'b'locl'-:s with collapsible mandrel tor corrugating the flange of the drum; 9 is a similar View for channel section flange; and Fig. 10 is a sinti-ilar View with :ren'ioyable mandrel manually manipulated.

Referring to the drawings 11 indicates the main frame comprising the base 12, the upright portions 13 arranged at an angle thereto and the brace webs 14: at the rear of the uprightportion and surrounding the up- 4 J forth inthe right portion 18 at each side with the base portion 12, Rigidly secured to the front face of the upright portion 113 is the sector plate 115 comprising an inner ring 16 and outer ring 17 and a series of connecting {sectors 18 sodiinensioned and arranged asto leave Tadial openings between the sectors, and where the sectors are connected to the inner outer rings, grooved portio'nslt) and 19 respectively will be provided. Each sector 18 i i ed Withan outwardly 1.01" forwardlly projecting sector 20 considerably smaller than the sector 18 and so positioned to serve as guides for theshrinkerblocks-21 arranged between the said guide sectors 20, each shrinker ibloclz 21 lntving a depending portion 22 and an integral guide member which WOT'kS between the sectors '18 and in the grooves 19 and 19 The shrinkerblooks 21 slide upon the sectors 18 and between the sectors 20 and each shrinker block 21 is formed with a recess 2a in the outer end thereof in which turns a roller '25 having its ends journaled in the openings26 produced in the block, said roller projecting slight ly beyond the outer end of'said block and is adapted to be engaged by the wedge blocks 27 rigidly connected :to the inner taco of the shrinking ring 28, said ring 28 resting upon the outer portions .of the sectors 18 and emhracing the sectors 20 as most clearly shown in Figs. '1 and At its upper end {the shrinking ring 28 is formed with an upwardv projecting arm 29 which is shifted from sale :to side by the hydnanlically ope-rated piston 30 and yoke .31, the piston operating in the hydraulic cylinder 32 and the yoke being connected and operated from the second piston also arr nged and operated from the cylinder; and the ainoun-tof flow can be regulated by means .ozt an adjustable stop 34. The hydraul cylinder is arranged at the upper end of the upright portion of the main frame and may hoof any suitable construction so ilong as the operation thereof will serve to s'hi fit the arm 29 hack and forth; and it will he understood when the arm 29 is shifted in Uhe direction i1 heated by the arrow, t heswedge b'1-oc l'ts-27 WV-ill be forced to ride upon the roliers 25 carried by the shrin ker blocks and force the same radially inwardly a definite distance and the brake drum being placed Within the said shrinker time brought to a perfectly true circle, thereby avoiding the necessity of machining or reshaping the periphery of the drum.

Inasmuch as the brake drums vary considcrably'in diameter, I provide for such variations by arranging removable shrinker block sections 21 which are bolted to and therefore constitute a part of the shrinker blocks proper.

In connection with the shrinker blocks I employ a mandrel 50 which is centrally mounted with reference to said shrinker blocksand upon which the brake drum is placed and supported during the shrinking and shaping operations; and in practice I prefer to employ a plurality of knock-out pins working through the mandrel and operated from the hydraulic cylinder 52 suitably mounted at the rear of the main frame. I also provide a sizing and facing mandrel 53 operated by the-hydraulic jack 54E and adapted to contact with the front face of the brake drum and hold the same from buckling and also bring said face into a perfectly true plane with relation to the periphery of the drum; and it will be understood that this mandrel 53' will be in' position during the shrinking operation and withdrawn immediately afterwards and preceding the operation of the knock-out pins. In Fig. 8-1 have shown the shrinker block sections 21 and the mandrel 50 of such shape as to provide a corrugated flange upon Y the brake drum; and it will be understood that in this connection the mandrel 50 will be made collapsible so that the brake drum with corrugated flange can be removed therefrom. In Fig. 9 the sections 21 and mandrel 50 are shaped to. provide a channel section flange and in this connection the mandrel 50 will also be collapsible. In Fig. 10 I have shown a mandrel 50 pro- 'vided. with a handle 50*, the brake drum being fitted upon the mandrel and placed between the shrinker blocks 21 which are shaped somewhat differently from the sections 21 inasmuch as in this instance the face of the brake drum is placed inwardly instead of outwardly and when this manually operated mandrel is employed the knockout pins and the facing mandrel will not be employed. The manner of operating the shrinker blocks by means of the shrinking ring 28 has already been described and it will be understood that upon the reverse movement of the arm 29 this ring 28 will be moved vin the reverse direction carrying with it the wedge blocks and the shrinking blocks will then be expanded to. their normal positions by 'means of the spring 34. The springs 34 are arranged within the radial openings 19 and bear at their inner shrinking block. B

ends upon the inner ring 16 and at their 7 outer ends are connectedcap screws 36 screwed into the inner or rear face of the means. of this construction as the shrinking block is forced inwardly the spring 34 is compressed and as soon as the working pressure is relieved this spring 34 exerts pressure upon the block and moves the same radially outwardly. It will thus be seen that in order to properly size and shape a brake drum which has been previousl punched from heavy sheet metal it will on y be necessary to arrange the drum upon the proper mandrel, apply pressure thereto by means of the shrinker blocks and facing mandrel and then reverse the move- 7 ments of said facing mandrel and shrinker 1 blocks and remove the brake drum by means of the knock-out pins in the construction shown in Fig. Q'and remove the same manually in the construction shown in Fig.10..

.In the construction shown in Figs. 8 and, 9

it will be understood that the facing mandrel will also be used in connectionv with the collapsible mandrel and that any suitable knock-out feature can be used in connection with the collapsible mandrels shown in Figs. 8 and 9. I

Having thus described my invention what I claim is a V 1. The combination with a radially grooved back plate, of a plurality of radially movable sectors and means for moving the same, a centrally disposed mandrel adapted to receive a brake drum, shrinker blocks carried by the movable sectors and engagingthe flange of the brake drum and means for engaging the face of the brake drum. Y Y

2. The combination with a radially grooved back plate, of radially movable sjectors and means for moving the same, a centrallydisposed mandrel adapted to receive the brake drum, shrinker blocks carried by the movable sectors and adapted to engage the flange of the brake drum, meansfor en'-- gaging the face of the brake drum and means GEORGE o. BRAINARD. 

